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General Science / Re: What is centrifugal force?
« on: 28/12/2018 08:40:53 »your second one which refers to a sustained centrifugal force is actually talking about reactive centrifugal force which is a real force - it is just referred to in a more economical way (by missing out the word "reactive") that depends on the reader applying correct understanding to it.As I´ve already said, it´d be useless to continue here our so long discussion
on the thread about tides ...
But I want to repeat I don´t agree with some of your "basic" dynamics ideas, e.g., what quoted ...
Centrifugal forces, the ones really acting in nature, are always manifestations of inertia when physical objects are accelerated "centripetally" (therefore, moving along a curved trajectory), whatever the essence of the required centripetal force and rest of circumstances.
The "fictitious" ones only "exist" inside our minds, when we use rotating frames of reference for our calculations ... In that "virtual" scenario, as actually rotating objects kind of "stop" their rotation (--> no centripetal acceleration and no inertial effects), we "need" to introduce a "fictitious" external centrifugal force, that causes effects IDENTICAL to the ones actually caused by the sheer fact of the kind of "hidden" rotation ...
But those effects do exist in the real, natural scenario.
By the way, this very morning I saw a clip on Discovery Max tv, where a CD was made rotate at the r.p.m. of a hoover ... The CD suddenly breaks into hundred of small pieces, obviously due to huge tensile internal stresses due to both centripetal and centrifugal forces (the former causing the rotation, and the later the way inertia manifests itself, because all CD particles are being hugely accelerated).
And that, happening in nature, has nothing to do with frames of reference !!